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Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | $ 927,193 |  | $ 780,079 |  |  |
Gross Unrealized Gains | 1,771 |  | 194 |  |  |
Gross Unrealized Losses | (17,211) |  | (26,381) |  |  |
Estimated Fair Value | 911,753 |  | 753,892 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 1,076,033 |  | 1,160,868 |  |  |
Gross Unrealized Gains | 3,113 |  | 1,553 |  |  |
Gross Unrealized Losses | (71,365) |  | (93,983) |  |  |
Estimated Fair Value | 1,007,781 |  | 1,068,438 |  |  |
Allowance for Securities Credit Losses | (902) | $ (958) | (1,133) | $ (932) | $ (964) | $ (1,128)
Total, amortized cost | 2,003,226 |  | 1,940,947 |  |  |
Total, gross unrealized gains | 4,884 |  | 1,747 |  |  |
Total, gross unrealized losses | (88,576) |  | (120,364) |  |  |
Total, estimated fair value | 1,919,534 |  | 1,822,330 |  |  |
U.S. government and agency obligations |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 60,860 |  | 66,490 |  |  |
Gross Unrealized Gains | 12 |  | 0 |  |  |
Gross Unrealized Losses | (4,179) |  | (5,796) |  |  |
Estimated Fair Value | 56,693 |  | 60,694 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Corporate debt securities |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 15,967 |  | 10,096 |  |  |
Gross Unrealized Gains | 38 |  | 11 |  |  |
Gross Unrealized Losses | (795) |  | (981) |  |  |
Estimated Fair Value | 15,210 |  | 9,126 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 66,721 |  | 69,809 |  |  |
Gross Unrealized Gains | 508 |  | 391 |  |  |
Gross Unrealized Losses | (1,378) |  | (3,941) |  |  |
Estimated Fair Value | 65,851 |  | 66,259 |  |  |
Allowance for Securities Credit Losses | (763) |  | (987) |  |  |
Asset-backed securities |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 251,986 |  | 295,796 |  |  |
Gross Unrealized Gains | 294 |  | 0 |  |  |
Gross Unrealized Losses | (147) |  | (4,252) |  |  |
Estimated Fair Value | 252,133 |  | 291,544 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Agency residential |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 489,515 |  | 298,107 |  |  |
Gross Unrealized Gains | 1,427 |  | 183 |  |  |
Gross Unrealized Losses | (195) |  | (97) |  |  |
Estimated Fair Value | 490,747 |  | 298,193 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 703,899 |  | 765,632 |  |  |
Gross Unrealized Gains | 2,299 |  | 901 |  |  |
Gross Unrealized Losses | (54,907) |  | (70,040) |  |  |
Estimated Fair Value | 651,291 |  | 696,493 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Agency commercial |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 108,865 |  | 109,590 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (11,895) |  | (15,255) |  |  |
Estimated Fair Value | 96,970 |  | 94,335 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 81,137 |  | 82,734 |  |  |
Gross Unrealized Gains | 10 |  | 10 |  |  |
Gross Unrealized Losses | (3,435) |  | (3,678) |  |  |
Estimated Fair Value | 77,712 |  | 79,066 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
State and municipal debt obligations |  |  |  |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 203,822 |  | 222,009 |  |  |
Gross Unrealized Gains | 296 |  | 251 |  |  |
Gross Unrealized Losses | (10,668) |  | (14,550) |  |  |
Estimated Fair Value | 193,450 |  | 207,710 |  |  |
Allowance for Securities Credit Losses | (34) |  | (39) |  |  |
Non-agency commercial |  |  |  |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 20,454 |  | 20,684 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (977) |  | (1,774) |  |  |
Estimated Fair Value | 19,477 |  | 18,910 |  |  |
Allowance for Securities Credit Losses | (105) |  | (107) |  |  |
Total mortgage-backed securities |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |
Amortized Cost | 598,380 |  | 407,697 |  |  |
Gross Unrealized Gains | 1,427 |  | 183 |  |  |
Gross Unrealized Losses | (12,090) |  | (15,352) |  |  |
Estimated Fair Value | 587,717 |  | 392,528 |  |  |
Allowance for Securities Credit Losses | 0 |  | 0 |  |  |
Debt securities held-to-maturity: |  |  |  |  |  |
Amortized Cost | 805,490 |  | 869,050 |  |  |
Gross Unrealized Gains | 2,309 |  | 911 |  |  |
Gross Unrealized Losses | (59,319) |  | (75,492) |  |  |
Estimated Fair Value | 748,480 |  | 794,469 |  |  |
Allowance for Securities Credit Losses | $ (105) |  | $ (107) |  |  |

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